#!/usr/bin/perl

use strict;
use warnings;
use Benchmark qw(cmpthese);

my @a = map { (rand() * 1000) / 1000 } 1 .. 1000;

cmpthese(-1, { 
  'GF'  => sub {GF($_)  for @a}, 
  'GF2' => sub {GF2($_) for @a}, 
  'dex' => sub {dex($_) for @a}, 
  'ccn' => sub {ccn($_) for @a}});


sub GF {
    my $number = abs($_[0] * 100);
    return $number - int ($number) > 0;
}


sub GF2 {
    my $number = $_[0] * 100;
    return $number - int ($number) > 0;
}

sub ccn {
    $_[0] =~ /\..../;
}

sub dex {
    my $number = $_[0];
    return (($number*100) - int($number*100) > 0);
}

__END__


      Rate  dex   GF  GF2  ccn
dex  931/s   --  -7% -19% -28%
GF  1000/s   7%   -- -13% -23%
GF2 1152/s  24%  15%   -- -11%
ccn 1297/s  39%  30%  13%   --